/*
 * Copyright 1992, 1993 The Regents of the University of California.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

typedef struct mcontext mcontext_t;
typedef struct ucontext ucontext_t;
extern int swapcontext(ucontext_t *, const ucontext_t *);
extern void makecontext(ucontext_t *, void(*)(), int, ...);

struct mcontext {
	/*
	 * These fields must match the corresponding fields in struct
	 * sigcontext which follow 'sc_mask'. That way we can support
	 * struct sigcontext and ucontext_t at the same time.
	 */
	int mc_onstack; /* sigstack state to restore */
	int mc_pc; /* pc at time of signal */
	int mc_regs[32]; /* processor regs 0 to 31 */
	int sr; /* status register */
	int mullo, mulhi; /* mullo and mulhi registers... */
	int mc_fpused; /* fp has been used */
	int mc_fpregs[33]; /* fp regs 0 to 31 and csr */
	int mc_fpc_eir; /* fp exception instruction reg */
	void *mc_tls; /* pointer to TLS area */
	int __spare__[8]; /* XXX reserved */
};

struct ucontext {
	/*
	 * Keep the order of the first two fields. Also,
	 * keep them the first two fields in the structure.
	 * This way we can have a union with struct
	 * sigcontext and ucontext_t. This allows us to
	 * support them both at the same time.
	 * note: the union is not defined, though.
	 */
	sigset_t uc_sigmask;
	mcontext_t uc_mcontext;
	struct __ucontext *uc_link;
	stack_t uc_stack;
	int uc_flags;
	int __spare__[4];
};
